Download or read book VAPORIZATION THERMODYNAMICS AND ENTHALPY OF FORMATION OF ALUMINUM SILICON CARBIDE written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vaporization Thermodynamics and Kinetics of Hexagonal Silicon Carbide written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mass spectrometer Knudsen effusion vaporization measurements over the temperature range 1835 to 2264K confirm earlier mass spectrometer results that Si(g) is the predominant vapor species above the SiC-C two-phase region. Si2C(g) and SiC2(g) are found to be the next most important vapor species. Total vapor pressures are measured to be a factor of 10 to 15 higher than values previously reported between 1800 to 2200K. Silicon partial pressures lead to a value of -7.5 kcal mol−1 for the enthalpy of formation of Sic(hexagonal) at 298K. Partial pressures of Si(g), SiC2(g), and Si2C(g) lead to third-law enthalpies of formation for SiC2(g) and Si2C(g) which are in accord with previously recommended values. Langmuir vaporization of SiC(hexagonal) (0001) single crystal faces in the mass spectrometer show ion intensities of Si and SiC2 that are time-independent after an initial induction period during which the intensities increase by a factor of 1.5 before attaining steady-state value. The mass spectrometer studies between 2200 to 2500K give activation enthalpies of .delta. H*(2350) = 141.6 +- 2.7 kcal mol−1 for Si(g) and .delta. H*(2350) = 166.2 +- 3.5 kcal mol−1 for SiC2(g) vaporization from the (0001) crystal face of hexagonal SiC. Constant temperature total mass-loss Langmuir vaporization experiments using SiC (0001) crystal faces show a time-dependent rate of mass-loss. It is believed that this time-dependent behavior is caused by a decrease in the SiC(hexagonal) single crystal surface area and is not due to impedance of silicon vaporization by the graphite layer formed on the crystal surface during decomposition.

Download or read book Thermodynamic Properties of Inorganic Materials written by Bertrand Cheynet and published by Elsevier Publishing Company. This book was released on 1989 with total page 1648 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is a bibliographical database of articles on thermodynamical properties of inorganic compounds, gases, solutions, metals and alloys, published between 1970 and 1987. This reference source book compiles 25,846 references about more than 13,400 systems and should be particularly useful for people working in inorganic chemical engineering, metallurgy, and new materials processing."--Preface.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat of Formation of Aluminum Carbide written by Alla D. Mah and published by . This book was released on 1964 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vaporization Thermodynamics of the Aluminum silicon Carbides Al4SiC4 and AlSiC written by Elizabeth Ann Johnson and published by . This book was released on 1988* with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of Los Alamos Research written by Los Alamos National Laboratory and published by . This book was released on 1985 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some Thermodynamic Properties of Silicon Carbide written by G. L. Humphrey and published by . This book was released on 1952 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1985 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Thermodynamics of the Silicon Carbide silicon carbon Vapor System written by Firmin Joseph Krieger and published by . This book was released on 1968 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the thermodynamic properties of silicon carbide (SiC) over a range of temperatures up to 6000K and pressures up to 1000 atmospheres. Two sets of equilibrium composition equations are used--one representing a pure gas phase, the other a heterogeneous system of gas and condensed (solid) silicon carbide. The gas phase of the heterogeneous chemical system, like the homogeneous gas phase, comprises 25 gaseous silicon-carbide species. Tabulated summaries give computed values of volume, molecular weight, moles of gas, moles of solid SiC, density, enthalpy, energy, and entropy for silicon carbide at various temperatures and pressures. A conventional Mollier diagram is included in which specific enthalpy is plotted against specific entropy, with cross plots of temperature, pressure, and molecular weight in the pure gas region, and cross plots of temperature and moles of condensed SiC in the gas-solid region. Variation of sublimination temperature with pressure for silicon carbide and graphite is also shown.

Download or read book VAPORIZATION THERMODYNAMICS OF ALUMINUM CARBIDE written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1976 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Thermodynamics of the Aluminum Silicate aluminum silicon oxygen Vapor System written by Firmin Joseph Krieger and published by . This book was released on 1968 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the thermodynamic properties of aluminum silicate, 3Al2O3.2SiO2, over a range of temperatures up to 6000K and pressures up to 1000 atmospheres. Three sets of equilibrium composition equations are used--one representing a pure gas phase, the second a heterogeneous system of gas and condensed alumina, and the third a heterogeneous system of gas and condensed alumina and silica. The gas phase of the heterogeneous chemical systems, like the homogeneous gas phase, comprises 18 gaseous aluminum-silicon-oxygen species. Tabulated summaries give computed values. A conventional Mollier diagram is included in which specific enthalpy is plotted against specific entropy, with cross plots of temperature, pressure, and molecular weight or moles of condensed alumina and silica. (Author).

Download or read book INIS Atomindex written by and published by . This book was released on 1985 with total page 1434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1963 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1972 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: